Method of spinning artificial filaments



Patented Oct. 30,

. UNITED sTATas BUDOLI' PATENT. onca.

TEDD OI SPINNING ARTIFICIAL IILAIENTB.

Io 1mm. Application fled June'll, 1m, 861181 No. 116,018, and 1n Germany June 11, 1m.

p This invention refers to a rocem of facilitating the manipulation an im roving the spinnin qualities of cellulose-so utions, viscose an 'the like. In the manufacture of artificial silk from cellulose solutions there are sometimes difiiculties in the formation of the threads, inasmuch-as, when the two heterogeneous systems of material, the spinnin solution and the precipitating bath are ma e to act upon each other, surface tension is produced which has an unfavorable influence upon the formation of the threads.

Now, we have ascertained that these difiiculties may be overcome with certainty, if

provision is made to reduce the surface tension on the bounding surfaces of the two systems b the addition of suitable sub stances. s substances to be added for this purpose we have found according to our invention small amounts of naphthalene-sulphonic acid which are alkyl-substituted in the ring, or their salts or other derivatives to be particularly suitable, and of these naphthalene-sul honic acids have been shown to be pre erable which are substituted by alkyls with several carbon-atoms, and the salts and derivatives of such sulphonic acid. We have found that suchsulphonic acids of naphthalene are very well suitable for the urpose which, besides the substituting a kyl-groups contain a plurality of sulpho-groups in the core, and of these particularl the diand tri-sulphonic acids may be used with preference, and as such for instance isopropyl-naphthalene-di-sulphomc acid. The particular important advantage of the employment of this kind of sulphomc acids for the purpose in question resides in the fact that they possem an almost unlimited solubility.

It is only necessary to add a small quantity of these substances either tothe cellulosesolutions themselves or to the precipitating baths employed in each case, or to both of them at a time. By the employment of these substances the spinning process is facilitated and on thepther hand the quality of the threads themselves .is very favorably influenoed.

The process may be employed with cellulose-solutions of all kinds, such as solutions in copper-oxide-ammonia, chloride of zinc,

and for cellulose-acetate solutions, viscose- SOllltlOIlS and smular solutlons.

Ewamples for the carrying Ozit of the process.

1. 10 kilogrms. of a cellulose-acetate spinning solution are treated with a solution of 10 guns. of the purified sodium-salt of the substituted beta-naphthalene-sul honic acid in the just sufiicient quantity 0 acetone or acetic-ester, such as may be obtained by a suitable condensation of beta-naphthalenesulphonic acid with the mixture of higher alcohols which are obtained in the hydrogenation of the subsequent distillation residues of acetone.

2. To each 10 kilogrs. of a r'ecipitating solution comprising dilute sulphuric acid saturated with sodium-sulphate 100 grms. of isopropyl-naphthalene-sulphonic acid are added, such as may be obtained by a suitable condensation of beta-naphthalene-sulphonic acid with isopropyl-alcohol, and the usual purification. i

3. To each 100 kilogrs. of a recipitating bath which consists of dilute s phuric acid,

saturated with sodium-sulphate 100 grins. iso-propyl-naphthalene-di-sulphonic acid are added, such as may be obtained by a suitable condensation of beta-naphthalene-sulphonic acid with isopropyl-alcoholand suitable purification.

It will, of course, be understood that the invention is not restricted for its'execution to the particular kinds of material and pro- 5 portions hereinbefore recited for the purpose of exemplification, but it is susceptible of changes and modifications in the selection of such substances and of their relative proportions without deviating from the spirit and scope of the invention, as particularly 2. The process of improving the spinning qualities of cellulose-solutions of all kinds, which consists 'in treating such solutions with plrecipitat' agents in the presence of qualities of cellulose-solutions of all kinds 1 napht alene-sulp o-compounds, containing which consists in precipitating the same with iso-prqogyl radicals in the ring. sulphuric acid-baths, conta' alkali-suL 3. e process of improving the spinning phates and in the resence o ieo-propyli qualities of cellulose-solutions, which conring substituted nap thalene-sulphonic mid nets in precipitating the same in the presence compounds. of ring-alkaly-substituted naphthalene-poly eulphom'c acids. 'RUDOLF SAJITZ.

4. The process of improvmg the spinning FRIEDRICH POSPIEGH. 

